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| AA | [Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Amino_acid_fragment_ions.png/400px-Amino_acid_fragment_ions.png) | 0.1016/1044-0305(93)87006-X | [ionsource](https://www.ionsource.com/Card/immon/immon.htm) | [10.1002/chin.199624319](http://dx.doi.org/10.1002/chin.199624319) | [Prospector (MS-Comp)](https://prospector.ucsf.edu/prospector/cgi-bin/msform.cgi?form=mscomp) | [10.1186/1477-5956-9-2](http://dx.doi.org/10.1186/1477-5956-9-2) | 10.1016/j.ymeth.2004.08.013 | 10.1385/1597452750 (table 5) | 10.1021/ac902712f | [Prospector (MS-Product)](https://prospector.ucsf.edu/prospector/cgi-bin/msform.cgi?form=msproduct) | [ThermoFisher](https://tools.thermofisher.com/content/sfs/brochures/cms_040030.pdf) | 10.1074/mcp.O113.035915 | 10.1074/mcp.O113.035915 | 10.1021/ac902712f | [Prospector (MS-Product)](https://prospector.ucsf.edu/prospector/cgi-bin/msform.cgi?form=msproduct) | | 10.1385/1597452750 (table 5) | Sources | Best mass | Best formula | Loss | Loss formula | Interpreted loss | Interpreted formula | Final |
|-------|---------------------------------------------------------------------------------------------------------------------------|-----------------------------|------------------------------------------------|------------------------------------------|-----------------------------------------------------------------------|-----------------------------------------|-----------------------------|------------------------------|-------------------|--------------------------------------------------------------------------|---------------------------------------------------------------------|-------------------------|-------------------------|-------------------|--------------------------------------------------------------------------|------------------------------|---------|----------:|--------------|----------|--------------|------------------|-------------------------|------------|
| A | 44 | 44 | | 44 | | 44 | | 44.05 | | | 44.0500 | | | | | | 6 | 44.0500 | | | | | | |
| R | 129 | 129 | | 129 | | 129 | | 129.11 | | | 129.1140 | 129.1135 | C5H13N4+ | | | | 8 | 129.1138 | C5H13N4+ | | | | | |
| | | | 185 | | 185 | | | | | | | | | | | | 2 | 185 | | -55.8862 | | C-2O-2 | | C-2O-2 |
| | | | | | | | | 115.09 | | | | | | | | | 1 | 115.09 | | 14.0238 | | C1H2 | | C1H2 |
| | 112 | 112 | 112 | 112 | 112 | 112 | 112.09 | 112.09 | | 112.0869 | 112.0875 | | | | C5H10N3+ | C5H10N3+ | 12 | 112.0872 | C5H10N3+ | 17.0266 | H3N1 | | | H3N1 |
| | 100 | 100 | 100 | 100 | 100 | 100 | 100.09 | | | 100.0869 | 100.0875 | | | | C4H10N3+ | | 10 | 100.0872 | C4H10N3+ | 29.0266 | C1H3N1 | | | C1H3N1 |
| | 87 | 87 | 87 | 87 | 87 | 87 | 87.09 | 87.09 | 87.0922 | 87.0917 | | | | C4H11N2+ | C4H11N2+ | | 12 | 87.0920 | C4H11N2+ | 42.0218 | C2H2N2 | | | C2H2N2 |
| | 73 | 73 | 73 | | 73 | 72 | 73.00 | | 73.0640 | | | | | C2H7N3+ | | | 8 | 73.0640 | C2H7N3+ | 56.0498 | C3H6N1 | | | C3H6N1 |
| | 70 | 70 | 70 | 70 | 70 | 70 | 70.07 | 70.07 | 70.0657 | 70.0651 | 70.0657 | | | C4H8N1+ | C4H8N1+ | | 13 | 70.0655 | C4H8N1+ | 59.0483 | C1H5N3 | | | C1H5N3 |
| | | | | | | | | 60.06 | | | | | | | | | 1 | 60.06 | | 69.0538 | | C3H4N2O-1 | C2H6N1O1+ | C3H4N2O-1 |
| | | 59 | | | | 59 | | | 59.0483 | | | | | CH5N3+ | | | 4 | 59.0483 | CH5N3+ | 70.0655 | C4H8N1 | | | C4H8N1 |
| | | | | | | | | | 43.0296 | | | | | C1H3N2+ | | | 2 | 43.0296 | C1H3N2+ | 86.0842 | C4H10N2 | | | C4H10N2 |
| | 29 | | | | | | | | | | | | | | | | 1 | 29 | | 100.1138 | | | H1N2/C1H1O1/C1H3N1/C2H5 | |
| N | 87 | 87 | 87 | 87 | 87 | 87 | 87.09 | 87.06 | | 87.0553 | 87.0558 | | | | C3H7N2O1+ | | 11 | 87.0556 | C3H7N2O1+ | | | | | |
| | 70 | 70 | 70 | 70 | | 70 | | 70.03 | | | 70.0293 | | | | | C3H4N1O1+ | 8 | 70.0293 | C3H4N1O1+ | 17.0263 | H3N1 | | | H3N1 |
| D | 88 | 88 | 88 | 88 | 88 | 88 | 88.04 | 88.04 | 88.0399 | 88.0393 | 88.0399 | | | C3H6N1O2+ | C3H6N1O2+ | | 13 | 88.0397 | C3H6N1O2+ | | | | | |
| | 70 | | 70 | 70 | | 70 | | 70.03 | | | 70.0293 | | | | | C3H4N1O1+ | 7 | 70.0293 | C3H4N1O1+ | 18.0104 | H2O1 | | | H2O1 |
| C | 76 | | | 76 | | 76 | | | | | 76.0221 | | | | | | 4 | 76.0221 | | | | | | |
| E | 102 | 102 | | 102 | 102 | 102 | 102.06 | 102.05 | 102.0555 | 102.0550 | 102.0555 | 102.0550 | C4H8N1O2+ | C4H8N1O2+ | C4H8N1O2+ | | 14 | 102.0553 | C4H8N1O2+ | | | | | |
| | | | | 91 | | | | | | | | | | | | | 1 | 91 | | 11.0553 | | | | |
| | | | | 84 | | | | 84.04 | | | 84.0449 | | | | | C4H6N1O1+ | 4 | 84.0449 | C4H6N1O1+ | 18.0104 | H2O1 | | | H2O1 |
| Q | 101 | 101 | 101 | 101 | 101 | 101 | 101.11 | 101.11 | | 101.0709 | 101.0715 | 101.0709 | C4H9N2O1+ | | C4H9N2O1+ | | 13 | 101.0711 | C4H9N2O1+ | | | | | |
| | 129 | 129 | 129 | 129 | 129 | 129 | 129.1 | 129.11 | | 129.0659 | 129.1028 | | | | C5H9N2O2+ | | 11 | 129.0844 | C5H9N2O2+ | -28.0133 | C-1O-1 | | | C-1O-1 |
| | 84 | 84 | 84 | 84 | 84 | 84 | 84.08 | 84.04 | 84.0813 | 84.0444 | 84.0449 | | | C5H10N1+ | C4H6N1O1+ | C4H6N1O1+ | 14 | 84.0569 | C5H10N1+ | 17.0142 | H3N1 | | | H3N1 |
| | 56 | | | 56 | | 56 | | 56.05 | | | 56.0500 | | | | | | 5 | 56.0500 | | 45.0211 | | C1H3N1O1 | | C1H3N1O1 |
| G | 30 | 30 | | 30 | | 30 | | 30.03 | 30.0344 | | 30.0344 | | | C1H4N1+ | | | 8 | 30.0344 | C1H4N1+ | | | | | |
| H | 110 | 110 | 110 | 110 | 110 | 110 | 110.07 | 110.07 | 110.0718 | 110.0713 | 110.0718 | 110.0713 | C5H8N3+ | C5H8N3+ | C5H8N3+ | | 15 | 110.0716 | C5H8N3+ | | | | | |
| | 166 | 166 | | | | 166 | | | | | | | | | | | 3 | 166 | | -55.9284 | | C-2O-2 | | C-2O-2 |
| | 138 | 138 | | | | 138 | 138.07 | | | 138.0662 | | | | | C6H8N3O1+ | | 6 | 138.0662 | C6H8N3O1+ | -27.9946 | C-1O-1 | | | C-1O-1 |
| | 123 | 123 | | | | 123 | | | | | | | | | | | 3 | 123 | | -12.9284 | | H3O-1 | | H3O-1 |
| | 121 | 121 | | | | 121 | | | | | | | | | | | 3 | 121 | | -10.9284 | | H5O-1 | | H5O-1 |
| | 82 | 82 | | | | 82 | | | 82.0531 | | | | | C4H6N2+ | | | 5 | 82.0531 | C4H6N2+ | 28.0185 | C1H2N1 | | | C1H2N1 |
| I/L/J | 86 | 86 | 86 | 86 | 86 | 86 | 86.1 | 86.10 | 86.0970 | 86.0964 | 86.0970 | | | C5H12N+ | C5H12N1+ | | 13 | 86.0968 | C5H12N+ | | | | | |
| | 72 | 72 | | 72 | | 72 | | | | | 72.0449 | | | | | | 5 | 72.0449 | | 14.0519 | | C1H2 | | C1H2 |
| | 44 | | | 44 | | 44 | | | | | 44.0500 | | | | | | 4 | 44.0500 | | 42.0468 | | C3H6 | | C3H6 |
| K | 101 | 101 | 101 | 101 | 101 | 101 | 101.11 | 101.11 | | 101.1073 | 101.1079 | | | | C5H13N2+ | | 11 | 101.1076 | C5H13N2+ | | | | | |
| | 129 | 129 | 129 | 129 | 129 | 129 | 129.1 | 129.11 | | 129.1022 | | 129.1022 | C6H13N2O1+ | | C6H13N2O1+ | | 12 | 129.1022 | C6H13N2O1+ | -27.9946 | C-1O-1 | | | C-1O-1 |
| | | | | | | | | | | 126.0913 | | | | | C7H12N1O1+ | | 2 | 126.0913 | C7H12N1O1+ | -24.9837 | C-2H1N1O-1 | | | C-2H1N1O-1 |
| | 112 | 112 | | 112 | | 112 | | | | | | | | | | | 4 | 112 | | -10.8924 | | H5O-1 | | H5O-1 |
| | 84 | 84 | 84 | 84 | 84 | 84 | 84.08 | 84.08 | 84.0813 | 84.0808 | 84.0813 | | | C5H10N1+ | C5H10N1+ | C5H10N1+ | 14 | 84.0811 | C5H10N1+ | 17.0265 | H3N1 | | | H3N1 |
| | 70 | 70 | | | | 70 | | | | | | | | | | | 3 | 70 | | 31.1076 | | C1H5N1 | | C1H5N1 |
| | | | | | | | | 56.05 | | | 56.0500 | | | | | | 2 | 56.0500 | | 45.0576 | | C2H7N1 | | C2H7N1 |
| M | 104 | 104 | 104 | 104 | 104 | 104 | 104.05 | 104.06 | | 104.0528 | 104.0534 | | | | C4H10N1S1+ | | 11 | 104.0531 | C4H10N1S1+ | | | | | |
| | | | | | | 70 | | | | | | | | | | | | 70 | | 34.0531 | | H2S1 | | H2S1 |
| | 61 | 61 | | | | 61 | | | 61.0112 | | | | | C2H5S1+ | | | 5 | 61.0112 | C2H5S1+ | 43.0419 | C2H3N1 | | | C2H3N1 |
| | | | | | | | | | | | | | | | | C3H6N1+ | 1 | ?? | C3H6N1+ | ?? | C1H4S1 | | | C1H4S1 |
| F | 120 | 120 | 120 | 120 | 120 | 120 | 120.08 | 120.08 | 120.0813 | 120.0808 | 120.0813 | 120.0808 | C8H10N+ | C8H10N1+ | C8H10N1+ | | 15 | 120.0811 | C8H10N+ | | | | | |
| | 91 | 91 | | 91 | | 91 | | | | | 91.0548 | | | | | | 5 | 91.0548 | | 29.0263 | | C1H3N1 | C7H7+ | C1H3N1 |
| P | 70 | 70 | 70 | 70 | 70 | 70 | 70.07 | 70.07 | 70.0657 | 70.0651 | 70.0657 | | | C4H8N1+ | C4H8N1+ | | 13 | 70.0655 | C4H8N1+ | | | | | |
| | | | 126 | | 126 | | 126.06 | | | 126.055 | | | | | C6H8N1O2+ | | 5 | 126.0550 | C6H8N1O2+ | -55.9895 | C-2O-2 | | | C-2O-2 |
| S | 60 | 60 | 60 | 60 | 60 | 60 | 60.04 | 60.04 | | 60.0444 | 60.0449 | | | | C2H6N1O1+ | | 11 | 60.0447 | C2H6N1O1+ | | | | | |
| | | | | | | | | | | | | | | | | C2H4N1+ | 1 | ?? | C2H4N1+ | ?? | H2O1 | | | H2O1 |
| T | 74 | 74 | 74 | 74 | 74 | 74 | | 74.06 | 74.0606 | 74.0600 | 74.0606 | | | C3H8N1O1+ | C3H8N1O1+ | | 12 | 74.0604 | C3H8N1O1+ | | | | | |
| | | | | | | | | | | | | | | | | C3H6N1O1+ | 1 | ?? | C3H6N1O1+ | ?? | H2N1 | | | H2N1 |
| W | 159 | 159 | 159 | 159 | 159 | 159 | 159.09 | 159.09 | | 159.0917 | 159.0922 | 159.0917 | C10H11N2+ | | C10H11N2+ | | 13 | 159.0919 | C10H11N2+ | | | | | |
| | | 171 | | | | 171 | | | | | | | | | | | 2 | 171 | | -11.9081 | | H4O-1 | | H4O-1 |
| | 170 | 170 | 170 | | 170 | 170 | | | | | | | | | | | 5 | 170 | | -10.9081 | | H5O-1 | | H5O-1 |
| | 132 | | | 132 | | 132 | | 132.08 | | | 132.0813 | | | | | | 5 | 132.0813 | | 27.0106 | | C1H1N1 | | C1H1N1 |
| | 130 | 130 | 130 | 130 | 130 | 130 | | 130.07 | | | 130.0657 | | | | | | 8 | 130.0657 | | 29.0262 | | C1H3N1 | | C1H3N1 |
| | 117 | 117 | 117 | 117 | 117 | 117 | | | | | 117.0578 | | | | | | 7 | 117.0578 | | 42.0341 | | C2H4N1 | | C2H4N1 |
| | 100 | | | | | | | | | | | | | | | | 1 | 100 | | 59.0919 | | C3H9N1/C2H7N2 | | |
| | | | | 77 | | 77 | | | | | 77.0391 | | | | | | 3 | 77.0391 | | 82.0528 | | C4H6N2 | C6H5 | C4H6N2 |
| | 11 | | | | | | | | | | | | | | | | 1 | 11 | | 148.0919 | | | | |
| Y | 136 | 136 | 136 | 136 | 136 | 136 | 136.08 | 136.08 | 136.0762 | 136.0757 | 136.0762 | 136.0757 | C8H10N1O1+ | C8H10N1O1+ | C8H10N1O1+ | | 15 | 136.0760 | C8H10N1O1+ | | | | | |
| | 107 | 107 | | 107 | | 107 | | | | | 107.0497 | | | | | | 5 | 107.0497 | | 29.0263 | | C1H3N1 | | C1H3N1 |
| | 91 | 91 | | 91 | | 91 | | | | | 91.0548 | | | | | | 5 | 91.0548 | | 45.0212 | | C1H3N1O1 | | C1H3N1O1 |
| | | | | | | | | | 55.0184 | | | | | C3H3O1+ | | | 2 | 55.0184 | C3H3O1+ | 81.0576 | C5H7N1 | | | C5H7N1 |
| V | 72 | 72 | 72 | 72 | 72 | 72 | 72.08 | 72.08 | 72.0813 | 72.0808 | 72.0813 | | | C4H10N1+ | C4H10N1+ | | 13 | 72.0811 | C4H10N1+ | | | | | |
| | 69 | | | 69 | | 69 | | | | | 69.0704 | | | | | | 4 | 69.0704 | | 3.0107 | | C1H1O-1 | | C1H1O-1 |
| | 55 | | | 55 | | 55 | | | | | 55.0548 | | | | | | 4 | 55.0548 | | 17.0263 | | H3N1 | | H3N1 |
| | 44 | | | | | | | | | | | | | | | | 1 | 44 | | 28.0811 | | C1H2N1 | | C1H2N1 |
| | | | | 41 | | 41 | | | | | 41.0391 | | | | | | 3 | 41.0391 | | 31.0420 | | C1H5N1 | | C1H5N1 |